AirHint found the following cheapest return flights from Seoul (ICN) to Porto (OPO) in December 2025 (see full year).

Return flights

09 Dec - 16 Dec	Air China
06 Dec - 13 Dec	Air China
24 Dec - 04 Jan	Air China
16 Dec - 20 Dec	China Eastern
13 Dec - 29 Dec	KLM
06 Dec - 10 Dec	KLM
06 Dec - 11 Dec	KLM
23 Dec - 04 Jan	Air China
14 Dec - 07 Jan	KLM
28 Dec - 14 Jan	KLM
05 Dec - 09 Dec	Air France
12 Dec - 24 Dec	Etihad Airways
24 Dec - 29 Dec	KLM
28 Dec - 07 Jan	KLM
06 Dec - 09 Dec	KLM
28 Dec - 09 Jan	KLM
27 Dec - 07 Jan	KLM
31 Dec - 26 Jan	Air France
27 Dec - 11 Jan	KLM
31 Dec - 22 Jan	Air France

Also check the deals for one-way flights from Seoul to Porto in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seoul to Porto in December from $515

Return flights